| 摘要 |
PROBLEM TO BE SOLVED: To perform effective defrosting with constant stability in a defrosting operation while performing expected function of absorbing heat from outside air with constant stability in the defrosting operation. SOLUTION: In a normal operation, refrigerant R is sequentially circulated, in a refrigerant circuit, through a compressor 1, a radiating heat exchanger 2, an expansion mechanism 4, a parallel-connected circuit or serially-connected circuit of a windward part 3A and a lee part 3B in an endothermic heat exchanger 3, and the compressor 1. In the defrosting operation, the refrigerant R is sequentially circulated through the compressor 1, a parallel-connected circuit of the radiating heat exchanger 2 and the upstream part 3A of the endothermic heat exchanger 3, and the compressor 1.
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